/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package sudokupso;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Alex
 */
public class Pso extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        ServletInputStream input = request.getInputStream();

        
        try {

            StringBuilder builder = new StringBuilder();
            int i = input.read();
            while (i != -1) {
                builder.append((char)i);
                i = input.read();
            }

            System.out.println("[" + new Date().toString() + "] Received request: " + builder.toString().replaceAll("©", ""));
            
            int[][] fixedPart = SudokuParser.parseSudokuGame(builder.toString().replaceAll("©", ""));

            GeometricPSO algorithm = new GeometricPSO(fixedPart);
            Thread algorithmThread = new Thread(algorithm);
            algorithmThread.start();
            try {
                algorithmThread.join();
            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }

            StringBuilder responseBuilder = new StringBuilder();
            int[][] solution = algorithm.getGlobalBest().game;
            responseBuilder.append(algorithm.getGlobalBest().getFitness() + "\r\n");
            for (int j = 0; j < solution.length; j++) {
                for (int k = 0; k < solution.length; k++) {
                    responseBuilder.append(solution[j][k]+" ");
                }
                responseBuilder.append("\r\n");
            }
            out.write(responseBuilder.toString().getBytes().length);
            out.write(responseBuilder.toString());

        } catch (Exception ex) {
            out.write("Invalid request format!");
        } finally {
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "API for geometric PSO4Sudoku";
    }// </editor-fold>

}
